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WarPig

Member Since: 04 Dec 2009
Location: Sheffield
Posts: 1748

1996 Defender 110 300 Tdi USW Bonatti Grey

Ive read that stainless steel bolts touching aluminium can cause a corrosive reaction. Need to use copper grease or similar where they make contact?

Or shall I get my coat?

24th Dec 2010 10:36am

nakatanenga

Member Since: 12 Nov 2010
Location: Neumarkt
Posts: 546

We use aluminium based anti seize paste with our bolt kits. That sticks like shi... Copper grease gets washed awy pretty fast. WANTED:

SII or SIII in max 1.5k

24th Dec 2010 10:49am

dgardel

Member Since: 30 Nov 2008
Location: Veneto (Heart & Head)
Posts: 3586

nakatanenga wrote:
We use aluminium based anti seize paste with our bolt kits. That sticks like shi... Copper grease gets washed awy pretty fast.

I have the Nakatanenga kit and it is the best on the market.

A good A270 class stainless kit is rated as 11.9 class steel bolts better than the cheeper original 8.8 class standard LR zinc plated. Discovery 5 td6 HSE Stornoway Gray Outback Engineering Limited Edition

IID Pro MV License

24th Dec 2010 11:05am

Lorryman100

Member Since: 01 Oct 2010
Location: Here
Posts: 2686

I use Duralac Chromate paste when using dissimilar metals.

http://www.duncanyacht.co.uk/showpartnumbe...rID=248370

24th Dec 2010 12:51pm

DefenderOfTheEarth

Member Since: 09 Nov 2010
Location: Cornwall, UK
Posts: 1304

2007 Defender 110 Puma 2.4 XS CSW Tonga Green

Surely the bit I will be screwing these into is also steel? ( BEng Materials Engineering, Swansea 1997...) Defender 110XS SW gone... now VW California 180 4 Motion.

24th Dec 2010 9:05pm

Lorryman100

Member Since: 01 Oct 2010
Location: Here
Posts: 2686

DOTE wrote:

Surely the bit I will be screwing these into is also steel?

It sticks to the threads really well, on my boat when I need to replace fittings the threads coated in duralac are like new where as the bolt head or nut would be corroded. I don't claim to be a metallurgist just personal experience of using anti corrosive jointing compound when using different metals. As to needing it when using stainless steel bolts into a mild steel (zinc plated?) nut, I don't know the answer to that but would still use it. Also I cant tell just by looking what parts of the body work are steel or aluminium, so I use duralac just in case it's dissimilar metals.

24th Dec 2010 9:27pm

DefenderOfTheEarth

Member Since: 09 Nov 2010
Location: Cornwall, UK
Posts: 1304

Mild and stainless steel are slightly different un terms of reactivity but its a small "gradient."

All metals have a different measure if reactivity. The further apart they are on the reactivity table, the greater the corrosion potential. Zinc is very reactive so used as a sacrificial metal to protect less reactive steel.

That might make sense. Or it might not! Defender 110XS SW gone... now VW California 180 4 Motion.

24th Dec 2010 9:49pm

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